Note 11 - Commitments and Contingencies (Details Textual) - Office and Distribution Warehouse Space [Member]	Nov. 26, 2018 USD ($) ft²
Lessee, Operating Lease, Term of Contract	2 years
Area of Leasing Property \| ft²	2,500
Operating Lease, Monthly Payment \| $	$ 1,600
Lessee, Operating Lease, Renewal Term	2 years

Area of the leasing property.

No definition available.

Name:	ctdh_AreaOfLeasingProperty
Namespace Prefix:	ctdh_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of monthly payment pursuant to the lease agreement.

+ References

No definition available.

+ Details

Name:	ctdh_OperatingLeaseMonthlyPayment
Namespace Prefix:	ctdh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=ctdh_OfficeAndDistributionWarehouseSpaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: